Initial Setup

[jessehartloff]

Setup the initial API. The API should include

POST /saveFile
-Takes a file in the request and saves it in persistent storage
-Request contains the path for the file record (eg. '/courseid/assignmentid/userid/submissionid') and the contents of the file

GET /retrieveFile/:file-record-path
-Returns the requested file

GET /list
-Returns a list of all fileRecordPaths available in storage

GET /metadata/:file-record-path
-Returns metadata about the requested record
-Metadata includes: file size, createdAt, updatedAt, path on disk, file record name, file type